FIX. RadScheduler - missing appointments after changing the Timescale when you manipulate the FocusedDate

To reproduce:
1. Add a RadScheduler, a RadSchedulerNavigator and a RadButton. Use the following code and run the project:
private void radButton1_Click(object sender, EventArgs e)
{
SchedulerTimelineView timelineView = radScheduler1.GetTimelineView();
this.radScheduler1.FocusedDate = new DateTime(DateTime.Now.Year,DateTime.Now.Month,1);
timelineView.ShowTimescale(Timescales.Weeks);
this.radScheduler1.SchedulerElement.UpdateCellContainers();
}
2. Switch to Timeline view and change the scaling to Hour.
3. Add and appointment and click the button. You will notice that the appointment is missing.
Workaround: change the FocusedDate after the scaling is changed.